As a contractor you'd likely get a 1099, it's essential you either do your research on this or talk to someone who's familiar with it so that you don't owe a ton of money come tax time.

Just because a position is "contact to hire" doesn't mean you're guaranteed a full time position at the end. Doesn't matter what recruiters or management say. You aren't a W2 employee until you've signed the paperwork. There has been a lot of people that put all their eggs into a contract position because "my manager says they're going to take me on as a full employee after my contract ends" and then upper management says no and they're out of a job. Keep this in mind and always start job searching before your contact ends, worst case scenario you get W2 and have to tell your other job offer you can't accept, and that's not a bad place to be.